Air filter silencing exhaust pipe and air filter

Abstract

The utility model belongs to the technical field of motor vehicles and air filters, and particularly relates to an air filter silencing exhaust pipe and an air filter. The exhaust pipe comprises a flexible pipe body and a rigid pipe body which are connected together; the rigid pipe body comprises an inner pipe body and an outer cover body covering the inner pipe body, a plurality of spacing plates arranged in the extending direction of the inner pipe body are arranged in a gap formed between the inner pipe body and the outer cover body, and a resonant cavity is formed between every two adjacent spacing plates; at least one opening corresponding to each resonant cavity is formed in the pipe wall of the inner pipe body, and the inner space of the inner pipe body is communicated with the resonant cavities. According to the air filter exhaust pipe, the sound wave interference principle is utilized, noise of different frequencies generated when airflow passes through is effectively reduced, the exhaust pipe is allowed to adapt to a complex installation path, and the air filter exhaust pipe can be conveniently installed in a narrow or irregular engine compartment. On the basis, the utility model further provides an air filter which has a good noise reduction effect, sealing performance and adaptation performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor vehicles and air filters, and in particular relates to an air filter silencer exhaust pipe and an air filter. Background Art

[0002] Automobile engines usually require a large amount of clean air for the combustion process. However, the air inhaled from the environment often contains various impurities, such as dust, sand, water vapor, etc. If these impurities enter the engine, they may cause wear of components such as the cylinder block, piston rings, and crankshaft, thus affecting the performance and life of the engine.

[0003] To solve this problem, the prior art generally uses an air filter to filter the air entering the engine to protect the engine from damage by foreign matter. A conventional air filter generally includes a filter element for intercepting and capturing tiny particles in the air while allowing clean air to pass through and enter the engine.

[0004] However, the exhaust ducts equipped in most air filters on the market today mainly focus on achieving basic airflow guiding functions, which generate certain noise during airflow transmission, affecting the riding comfort of drivers and passengers. In addition, the complex and irregular spatial layout in the engine compartment of modern cars not only brings inconvenience to the layout and installation of exhaust pipes, but also brings certain challenges to ensuring the sealing performance of the connection parts during the installation process. The connection parts need to effectively cope with the strong vibrations and pressure fluctuations generated during the operation of the engine, especially in harsh use environments, such as in off-road vehicles, high-performance sports cars and other use scenarios, which are more prone to leakage and affect the filtration efficiency.

[0005] In view of this, developing an air filter that can effectively reduce airflow noise, flexibly adapt to complex installation conditions, and ensure a high degree of sealing performance at the connection with the engine can not only improve the overall driving experience of the vehicle, but also effectively reduce the production and maintenance costs of automobile manufacturers. It has considerable market demand and technological advancement value. Utility Model Content

[0006] Aiming at the deficiencies in the prior art, the utility model provides an air filter silencer exhaust pipe and an air filter.

[0007] The first aspect of the utility model is to provide an air filter silencer exhaust pipe, comprising a flexible pipe body and a rigid pipe body connected together; the rigid pipe body comprises an inner pipe body and an outer cover body arranged outside the inner pipe body, a plurality of partition plates arranged along the extension direction of the inner pipe body are arranged in the interval formed between the inner pipe body and the outer cover body, and a resonance cavity is formed between adjacent partition plates; at least one opening is arranged on the pipe wall of the inner pipe body and corresponding to each resonance cavity, so that the internal space of the inner pipe body is connected with the resonance cavity.

[0008] As a further optimization scheme, the partition plate with the largest radial dimension among the multiple partition plates on the outside of the inner tube body is recorded as the reference partition plate, and the remaining partition plates are arranged on both sides of the reference partition plate, and the radial dimensions decrease from the reference partition plate to both sides; the outer cover body is divided into two sections, which are connected to each other from both sides of the reference partition plate to the middle.

[0009] As a further optimization solution, a limiting step that abuts against the partition plate is provided on the inner wall of the outer cover, and a stop block is also provided on the inner wall of the outer cover and adjacent to the limiting step, and a partition plate is defined between the stop block and the limiting step.

[0010] As a further optimization solution, the anti-slip stop block is sloped, so that a guiding slope is formed on the surface to guide the spacer plate to slide into the gap between the anti-slip stop block and the limiting step.

[0011] As a further optimization solution, corresponding to each resonance cavity, at least one pair of openings penetrating each other is provided on the inner tube body.

[0012] As a further optimization scheme, the flexible tube body is a corrugated tube, and annular grooves are provided at the proximal and distal ends of the flexible tube body, and a first adjusting clamp is pre-installed in the annular groove; the distal end of the flexible tube body is sleeved on the proximal end of the rigid tube body, and the first adjusting clamp is tightened at the connection.

[0013] As a further optimization scheme, a connecting neck is provided at the far end of the rigid tube body. The connecting neck is in the shape of a short tube and has a number of axially extending caliber adjustment notches arranged circumferentially on the tube wall. An elastic sealing ring is sleeved on the connecting neck; and a second adjustment clamp is also clamped on the elastic sealing ring.

[0014] As a further optimization solution, the end of the connecting neck has a radially outwardly protruding flange; under the tightening action of the second adjusting clamp, the elastic sealing ring is compressed inward to form an interlocking with the flange.

[0015] As a further optimization scheme, the elastic sealing ring includes an inner ring body and an outer ring body that are coaxially connected. The inner ring body and the outer ring body are connected to each other at the distal end and form an opening at the proximal end; the connecting neck is inserted from the opening at the proximal end of the outer ring body and embedded in the gap between the inner ring body and the outer ring body; a second adjustment clamp is provided on the outer ring body.

[0016] As a further optimization solution, the caliber adjustment notch part occupies the axial length of the connecting neck, thereby forming a notch-free section at the root of the connecting neck; a number of annular patterns are formed on the outer wall of the proximal end of the inner ring body, and the annular patterns are closely attached to the inner wall of the notch-free section.

[0017] The second aspect of the utility model is to provide an air filter silencer exhaust pipe, comprising a shell, and also comprising an air intake pipe and an exhaust pipe connected to the shell; a filter element is provided in the shell to divide the internal space of the shell into an air intake chamber and an exhaust chamber; the air intake pipe is connected to the air intake chamber to introduce the air to be filtered into the air intake chamber; the exhaust pipe is connected to the exhaust chamber to discharge the air entering the exhaust chamber after being filtered by the filter element; wherein the exhaust pipe is the above-mentioned air filter silencer exhaust pipe.

[0018] Beneficial Effects

[0019] The air filter exhaust pipe provided by the utility model, by arranging a resonance cavity formed by a partition plate inside a rigid pipe body, utilizes the principle of sound wave interference to effectively reduce noise of different frequencies generated when airflow passes through, which not only improves the comfort in the cockpit, but also reduces noise pollution to the outside world.

[0020] The air filter exhaust pipe provided by the utility model has a structure combining a flexible pipe body and a rigid pipe body, which allows the exhaust pipe to adapt to complex installation paths while ensuring noise reduction performance, and is convenient for installation in a narrow or irregular engine compartment. In addition, the decreasing size distribution of the partition plate from the center to the two sides cooperates with the two-section docking structure of the rigid pipe body, so that the exhaust pipe can better adapt to the curved and twisted layout, and improve the installation flexibility in a limited space.

[0021] The air filter exhaust pipe provided by the utility model realizes a tight seal at the connection through the cooperation of the connecting neck, the elastic sealing ring and the second adjusting clamp, thereby ensuring the efficiency and filtering effect of the engine intake system, and is particularly suitable for environments with large vibrations or pressure fluctuations. At the same time, it also enables the exhaust pipe to adapt to connecting components of different diameters, reduces the need for additional adapter components, improves the versatility of the product, and reduces production and inventory costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , Figure 2 A schematic diagram of the air filter structure.

[0023] Figure 3 Schematic diagram of the explosion inside the air filter housing.

[0024] Figure 4 Schematic diagram of the structure of the filter element.

[0025] Figure 5 Schematic diagram of the exhaust pipe structure.

[0026] Figure 6 It is a structural schematic diagram of a rigid tube body.

[0027] Figure 7 It is a schematic diagram of the structure of the outer cover.

[0028] Figure 8 It is a schematic diagram of the cooperation between the connecting neck and the elastic sealing ring.

[0029] Fig. 9 It is a schematic diagram of the structure of the elastic sealing ring.

[0030] In the figure: 1, shell; 2, air inlet pipe; 3, exhaust pipe; 4, filter element; 11, first filter shell; 12, second filter shell; 31, flexible tube body; 32, rigid tube body; 33, first adjustment clamp; 34, elastic sealing ring; 35, second adjustment clamp; 41, filter element; 42, sealing frame; 43, reinforcement network; 111, first docking edge; 121, second docking edge; 321, partition plate; 322, outer cover body; 323, inner tube body; 325, connecting neck; 341, inner ring body; 342, outer ring body; 3221, limiting step; 3222, anti-slip block; 3251, flange; 3252, caliber adjustment notch. DETAILED DESCRIPTION

[0031] The air filter is a key component used in automobile engines. Its main function is to filter the air entering the engine and filter out foreign matter such as dust, sand, and water vapor in the air to protect the engine from damage by foreign matter. When the engine is running, a large amount of clean air is required for combustion, but the air often carries various impurities. If these impurities enter the engine, it will cause wear of components such as the cylinder block, piston rings, and crankshaft, seriously affecting the service life and performance of the engine. Therefore, it is necessary to install an air filter on the engine intake line.

[0032] The air filter provided by the utility model has a structure as follows Figure 1 and Figure 2 As shown, it includes a housing 1, and also includes an air inlet pipe 2 and an air outlet pipe 3 connected to the housing 1. Figure 3 As shown, a filter element 4 is provided in the shell 1 to divide the internal space of the shell 1 into an air inlet chamber and an air exhaust chamber; the air inlet pipe 2 is connected to the air inlet chamber to introduce the air to be filtered into the air inlet chamber; the air exhaust pipe 3 is connected to the air exhaust chamber to discharge the air that enters the air exhaust chamber after being filtered by the filter element 4.

[0033] The above-mentioned air filter is mainly used to supply clean, impurity-free air to the automobile engine, thereby ensuring the efficient and stable operation of the engine and extending its service life. Its working process is as follows:

[0034] Air intake stage: When the engine is running, a large amount of air is required to participate in combustion; the intake pipe 2 is located at the front end of the air filter and inhales air from the external environment. This air may carry various impurities, such as dust, sand, water vapor, etc.

[0035] Filtration stage: The inhaled air then enters the air intake chamber in the housing 1 through the air intake pipe 2, and then passes through the filter element 4; the filter element 4 can effectively intercept and capture tiny particles in the air, allowing clean air to pass through and enter the exhaust chamber.

[0036] Air discharge stage: The air purified by the filter element 4 enters the exhaust chamber. The exhaust pipe 3 is connected to the exhaust chamber to guide the clean air out and transport it to the next component, usually directly into the intake manifold of the engine, or in a turbocharged vehicle, into the turbocharger to increase the pressure before entering the engine.

[0037] like Figure 3 As shown, the housing 1 comprises a first filter housing 11 and a second filter housing 12 which are butt-jointed, and the first filter housing 11 has a first butt joint edge 111 at the opening, and the second filter housing 12 has a second butt joint edge 121 at the opening. Figure 4 As shown, it includes a filter element 41 of a specific thickness and a sealing frame 42 arranged along the edge of the filter element 41, and the sealing frame 42 is elastic; when the first filter housing 11 and the second filter housing 12 are in a docking state, the sealing frame 42 is pressed and fixed between the first docking edge 111 and the second docking edge 121.

[0038] The housing 1 is composed of a first filter housing 11 and a second filter housing 12 that are docked, so that the filter can be easily disassembled to replace or clean the filter element 41, thereby improving the convenience of maintenance. The user can regularly check or replace the filter element 41 without damaging the overall structure to ensure that the engine continues to obtain clean air. The first docking edge 111 and the second docking edge 121 are used for the tight connection between the first filter housing 11 and the second filter housing 12. The sealing frame 42 is located at the edge of the filter element 41 and is elastic. When the two filter housings are docked, the sealing frame 42 is squeezed on both sides and adaptively deformed to form a reliable sealing contact interface to prevent unfiltered air from bypassing the filter element 41 and directly entering the engine, thereby ensuring the filtering effect.

[0039] Preferably, the filter element 41 is a paper filter element or a non-woven fabric filter element.

[0040] Preferably, the sealing frame 42 is made of rubber, silicone, polyurethane and other materials, and has good elasticity and weather resistance. The sealing frame 42 can be prefabricated and installed on the edge of the filter element 41 by assembly, pasting and other methods, and is preferably combined with the edge of the filter element 41 by in-situ molding. In-situ molding allows the sealing frame 42 to be formed and fixed directly at the specified position of the filter element 41, which can achieve more precise size control and stronger bonding strength, reduce the possibility of gaps or looseness introduced by the assembly process, and thus improve the manufacturing accuracy and reliability of the entire filter.

[0041] As a further improvement, a reinforcement network 43 is formed on one side of the filter element 41 and in the area surrounded by the sealing frame 42. The reinforcement network 43 is integrally connected to the sealing frame 42 at the edge. Figure 4 The basic hexagonal structural unit shown is composed of a number of hexagonal network units continuously spread on the surface of the filter element 41, and through pores are formed in each network unit. The reinforced network 43 can also be formed by combining basic structural units of other shapes such as rectangles, triangles, and diamonds. The reinforced network 43 improves the mechanical strength and stability of the filter element 41 by forming a reinforcement structure on the surface of one side of the filter element 41. Especially when the filter element 41 is made of a relatively soft material or needs to withstand a higher airflow pressure, the reinforced network 43 can prevent the filter element 41 from being deformed or damaged due to air pressure difference or vibration, prevent the filter element 41 from affecting the sealing due to deformation, and also help to extend the service life of the filter element 41.

[0042] The following describes the exhaust pipe 3 of the air filter, which is connected to the housing 1 of the air filter and is used to discharge the clean air obtained after filtration from the air filter and introduce it into the engine or turbocharger. The exhaust pipe 3 has excellent sealing performance and silencing performance and is easy to assemble. For the convenience of description, for any component in the exhaust pipe 3, the end close to the air filter is recorded as the proximal end, that is, the end facing the airflow direction is the proximal end, and the end away from the air filter is recorded as the distal end, that is, the end along the airflow direction is the distal end.

[0043] like Figure 5 As shown, the exhaust pipe 3 includes a flexible pipe body 31 and a rigid pipe body 32 connected together. The rigid pipe body 32 is as shown in FIG. Figure 6 As shown, it includes an inner tube body 323 and an outer cover body 322 that is covered outside the inner tube body 323. A plurality of partition plates 321 arranged along the extension direction of the inner tube body 323 are provided in the interval formed between the inner tube body 323 and the outer cover body 322, and a resonance cavity is formed between adjacent partition plates 321; at least one opening is provided on the tube wall of the inner tube body 323 and corresponding to each resonance cavity, so that the internal space of the inner tube body 323 is connected to the resonance cavity. The flexible tube body 31 can bend and adapt to complex installation paths, and can be flexibly connected to a designated position without sacrificing sealing, thereby simplifying the installation process and improving assembly flexibility. The rigid tube body 32 provides a section of a structurally stable channel for the airflow, and a plurality of resonance cavities are arranged in the section of the channel to reduce noise of different frequencies. The resonance cavity noise reduction is based on the principle of sound wave interference. Multiple resonance cavities are formed by setting a partition plate 321 between the inner tube body 323 and the outer cover body 322. Each resonance cavity is equivalent to an acoustic filter, and each produces a resonance effect for sound waves of a specific frequency, so that the sound wave energy of these frequencies is greatly lost in the cavity, thereby achieving the effect of reducing noise. Preferably, corresponding to each resonance cavity, at least one pair of openings is provided on the inner tube body 323.

[0044] like Figure 6 As shown, the partition plate 321 with the largest radial dimension among the multiple partition plates 321 outside the inner tube body 323 is recorded as the reference partition plate, and the remaining partition plates 321 are arranged on both sides of the reference partition plate, and the radial dimensions decrease from the reference partition plate to both sides; the outer cover body 322 is divided into two sections, which are butted from both sides of the reference partition plate to the middle. The partition plates 321 are arranged in decreasing sizes, which reduces the obstruction of the partition plates 321 to the outer cover body 322 during assembly, and also avoids the wear of the inner wall of the outer cover body 322, ensures the tightness between the inner wall of the outer cover body 322 and the edge of the partition plate 321, and ensures that the noise reduction effect of the resonance cavity can be fully exerted according to the design. The outer cover body 322 is divided into two sections and butted from both sides to the middle, so that the exhaust pipe 3 can be designed into a more curved and twisted complex shape, and the outer cover body 322 can still complete the assembly, thereby improving the spatial adaptability of the exhaust pipe 3.

[0045] like Figure 7 As shown, a limiting step 3221 is provided on the inner wall of the outer cover 322, which is in contact with the spacer 321. A stopper block 3222 is also provided on the inner wall of the outer cover 322 and adjacent to the limiting step 3221, and the spacer 321 is defined between the stopper block 3222 and the limiting step 3221. The limiting step 3221 is provided on the inner wall of the outer cover 322, and is in contact with the edge of the spacer 321, so as to play a positioning and supporting role and determine the position of the spacer 321. The stopper block 3222 adjacent to the limiting step 3221 forms a clamping area together with the limiting step 3221, which limits the movement of the spacer 321 and prevents displacement due to vibration or external force after assembly. Preferably, the stopper block 3222 is in a slope shape, so as to form a guiding slope on the surface, and guide the spacer 321 to slide into the gap between the stopper block 3222 and the limiting step 3221.

[0046] like Figure 5 As shown, the flexible pipe body 31 is a corrugated pipe, and an annular groove is provided at the proximal end and the distal end of the flexible pipe body 31, and a first adjustment clamp 33 is pre-installed in the annular groove; the distal end of the flexible pipe body 31 is sleeved on the proximal end of the rigid pipe body 32, and the first adjustment clamp 33 is clamped at the connection. The flexible pipe body 31 adopts a corrugated pipe, which has good flexibility and can be bent into various angles without affecting its own integrity, which is suitable for the complex and compact space layout in the engine compartment of the automobile. The annular grooves are provided at the proximal end and the distal end of the flexible pipe body 31 and the first adjustment clamp 33 is pre-installed, which simplifies the assembly process of the exhaust pipe 3. By tightening or loosening the first adjustment clamp 33, the installation or maintenance operation can be conveniently completed.

[0047] like Figure 8As shown, a connection neck 325 is provided at the far end of the rigid tube body 32. The connection neck 325 is in the shape of a short tube, and a plurality of axially extending caliber adjustment notches 3252 are arranged circumferentially on the tube wall; an elastic sealing ring 34 is sleeved on the connection neck 325; and a second adjustment clamp 35 is also clamped on the elastic sealing ring 34. The caliber adjustment notch 3252 on the tube wall of the connection neck 325 allows the user to adjust the size of the connection neck 325 according to the diameter of the actual connection part, so as to achieve a close fit with the target connection component without the need for an additional adapter or conversion joint, thereby improving the flexibility and versatility of assembly and reducing the inventory and cost of the product. The elastic sealing ring 34 sleeved on the connection neck 325 can be made of rubber or other highly elastic materials, and is tightly fitted on the connection neck 325 to form a good sealing effect, prevent air leakage, and maintain the sealing and filtering efficiency of the engine intake system. The second adjustment clamp 35 is clamped on the elastic sealing ring 34 to further tighten the elastic sealing ring 34, and the sealing force can be easily fine-tuned by adjusting the tightness of the second adjustment clamp 35. The adaptability of the connecting neck 325, the sealing performance of the elastic sealing ring 34, and the tightness and adjustability of the second adjusting clamp 35 cooperate to achieve efficient, reliable and convenient connection between the exhaust pipe 3 and the engine system, while ensuring the sealing performance of the air circulation path and optimizing the performance of the entire intake system.

[0048] like Figure 8 As shown, the end of the connection neck 325 has a radially outwardly protruding flange 3251; under the tightening action of the second adjustment clamp 35, the elastic sealing ring 34 is pressed inward and interlocked with the flange 3251. The flange 3251 at the end of the connection neck 325 and its interaction with the elastic sealing ring 34 and the second adjustment clamp 35 together constitute an enhanced sealing structure. Specifically, when the second adjustment clamp 35 applies pressure to the elastic sealing ring 34, the elastic sealing ring 34 is forced to retract and fit tightly on the outer wall of the connection neck 325 and the flange 3251, forming an interlocking structure with each other, preventing the elastic sealing ring 34 from being displaced or falling off, significantly enhancing the reliability of the seal, and effectively preventing air leakage under more extreme vibration or pressure fluctuation conditions, ensuring long-term and reliable airtightness of the connection. At the same time, the interlocking of the flange 3251 and the elastic sealing ring 34 also simplifies the installation. The user only needs to appropriately adjust the tightness of the second adjustment clamp 35 to complete the sealing without the need for complicated tools or equipment. It is also convenient for future maintenance, inspection or replacement of the elastic sealing ring 34, thereby improving ease of maintenance.

[0049] like Figure 8 and Fig. 9As shown, the elastic sealing ring 34 includes an inner ring body 341 and an outer ring body 342 which are coaxially connected. The inner ring body 341 and the outer ring body 342 are connected to each other at the distal end and form an opening at the proximal end. The connecting neck 325 is inserted from the opening at the proximal end of the outer ring body 342 and embedded in the gap between the inner ring body 341 and the outer ring body 342. A second adjusting clamp 35 is clamped on the outer ring body 342. The elastic sealing ring 34 formed by the inner ring body 341 and the outer ring body 342 has a wrapping property. When the connecting neck 325 is inserted into the gap between the two ring bodies, the elastic sealing ring 34 can adapt to the change of the diameter of the connecting neck 325 through elastic deformation, can fully fit the inner and outer surfaces of the connecting neck 325, and also fully fit the pipeline inserted into the inner ring body 341 for connecting with the exhaust pipe 3, forming a tight sealing ring system, effectively preventing gas leakage at the connection. In addition, during installation, the connecting neck 325 can be easily inserted from the opening of the elastic sealing ring 34, which simplifies the assembly and replacement operations. It is particularly suitable for environments with limited space, and is also conducive to daily maintenance and troubleshooting, reducing maintenance costs.

[0050] like Figure 8 and Fig. 9 As shown, the caliber adjustment notch 3252 partially occupies the axial length of the connecting neck 325, thereby forming a gapless section at the root of the connecting neck 325; a number of annular lines are formed on the outer wall of the proximal end of the inner ring body 341, and the annular lines are close to the inner wall of the gapless section. While the caliber adjustment notch 3252 occupies a part of the axial length of the connecting neck 325, a continuous section without a gap is retained at its root. The existence of this gapless section enhances the structural stability of the connecting neck 325 itself and reduces the risk of cracking at the connection. Annular lines are formed on the outer wall of the proximal end of the inner ring body 341. When the elastic sealing ring 34 is installed in place, these annular lines will be close to the inner wall of the gapless section of the connecting neck 325, increasing the friction between the two contact surfaces while also increasing the number of sealing barriers between the two contact surfaces. Even under conditions of vibration or pressure changes, the elastic sealing ring 34 and the connecting neck 325 can still maintain a close fit to prevent air leakage.

[0051] The above implementation modes are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with the technology in this field can understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An air filter silencer exhaust pipe, characterized in that: The invention comprises a flexible tube body (31) and a rigid tube body (32) connected together; the rigid tube body (32) comprises an inner tube body (323) and an outer cover body (322) arranged outside the inner tube body (323); a plurality of partition plates (321) arranged along the extension direction of the inner tube body (323) are arranged in the interval formed between the inner tube body (323) and the outer cover body (322); a resonance cavity is formed between adjacent partition plates (321); and at least one opening is arranged on the tube wall of the inner tube body (323) and corresponding to each resonance cavity, so that the internal space of the inner tube body (323) is connected with the resonance cavity.

2. The air filter silencer exhaust pipe according to claim 1, characterized in that: Among the multiple spacer plates (321) outside the inner tube body (323), the spacer plate (321) with the largest radial dimension is recorded as a reference spacer plate, and the remaining spacer plates (321) are arranged on both sides of the reference spacer plate, and the radial dimensions decrease from the reference spacer plate to both sides; the outer cover body (322) is divided into two sections, which are butted against each other from both sides of the reference spacer plate to the middle.

3. The air filter silencer exhaust pipe according to claim 2, characterized in that: A limiting step (3221) abutting against the partition plate (321) is provided on the inner wall of the outer cover body (322), and a stop block (3222) is also provided on the inner wall of the outer cover body (322) and adjacent to the limiting step (3221), and the partition plate (321) is defined between the stop block (3222) and the limiting step (3221).

4. The air filter silencer exhaust pipe according to claim 3, characterized in that: The anti-slip stopper (3222) is in a slope shape, thereby forming a guide slope on the surface to guide the spacer plate (321) to slide into the gap between the anti-slip stopper (3222) and the limiting step (3221).

5. The air filter silencer exhaust pipe according to claim 2, characterized in that: The flexible tube body (31) is a corrugated tube, and an annular groove is provided at both the proximal end and the distal end of the flexible tube body (31), and a first adjustment clamp (33) is pre-installed in the annular groove; the distal end of the flexible tube body (31) is sleeved on the proximal end of the rigid tube body (32), and the first adjustment clamp (33) is clamped at the connection.

6. The air filter silencer exhaust pipe according to claim 2, characterized in that: A connecting neck (325) is provided at the far end of the rigid tube body (32). The connecting neck (325) is in the shape of a short tube and has a plurality of axially extending caliber adjustment notches (3252) arranged circumferentially on the tube wall. An elastic sealing ring (34) is sleeved on the connecting neck (325). A second adjustment clamp (35) is also clamped on the elastic sealing ring (34).

7. The air filter silencer exhaust pipe according to claim 6, characterized in that: The end of the connecting neck (325) has a radially outwardly protruding flange (3251); under the tightening action of the second adjusting clamp (35), the elastic sealing ring (34) is compressed and retracted to form an interlocking relationship with the flange (3251).

8. The air filter silencer exhaust pipe according to claim 7, characterized in that: The elastic sealing ring (34) comprises an inner ring body (341) and an outer ring body (342) which are coaxially connected. The inner ring body (341) and the outer ring body (342) are connected to each other at the distal end and form an opening at the proximal end. The connecting neck (325) is inserted from the opening at the proximal end of the outer ring body (342) and is embedded in the gap between the inner ring body (341) and the outer ring body (342). The second adjustment clamp (35) is clamped on the outer ring body (342).

9. The air filter silencer exhaust pipe according to claim 8, characterized in that: The caliber adjustment notch (3252) partially occupies the axial length of the connecting neck (325), thereby forming a non-notch section at the root of the connecting neck (325); a plurality of annular patterns are formed on the outer wall of the proximal end of the inner ring body (341), and the annular patterns are closely attached to the inner wall of the non-notch section.

10. An air filter, characterized in that: The invention comprises a shell (1), and also comprises an air intake pipe (2) and an air exhaust pipe (3) connected to the shell (1); a filter element (4) is provided in the shell (1) to divide the internal space of the shell (1) into an air intake chamber and an air exhaust chamber; the air intake pipe (2) is communicated with the air intake chamber to introduce air to be filtered into the air intake chamber; the air exhaust pipe (3) is communicated with the air exhaust chamber to discharge air that has entered the air exhaust chamber after being filtered by the filter element (4); the air exhaust pipe (3) is an air filter silencer exhaust pipe as claimed in any one of claims 1 to 9.

Images